Re: 50" LG Y-sustain IPM modules

By the way I think the thing that killed my YSUS in the first place was the top two caps in the bank of orange caps next to the top heat sink. It looks like they got too hot and bled out some waxy material that dripped down the board. The first thing I did to this set was swap those two caps from a cannibalized set, but didn't help, so I disregarded the issue and went on to other components. It wasn't till I tried to fire up the set I put the leakers into, and watched an IPM blow that I realized they may have started the cascade of failing components....

Re: 50" LG Y-sustain IPM modules

I had 16.3v on the YSUS before and after replacing the bad IPMs. I was told by a good source that that was OK. I had 18v on my good ZSUS. That is about all the info I can give you on voltages.

Please check your buffer boards for bad FETs. You could blow new IPMs if you don't find them first. I had one blown on the lower Y buffer. If you don't know how to check them just dig around on google. That's what I did. Even without removing them from the board, one behaved different than the others when probed. Coppell sells them now also....

Re: 50" LG Y-sustain IPM modules

By the way to remove the IPM modules from the board with minimal damage, I used an old Hand Copper made for soldering copper and lead sheet metal flashings for roofs, chimneys and plumbing pipes. I cut a slot along one corner of it with a hack saw. I let it sit and heat up with my propane torch blowing at it. I pointed the slot upward to create a trough and filled it with solder. I set the board over the hand copper with pins down and lowered it down so one row of pins dipped into the molten solder. A little wiggling and pulling and that side...

Re: 50" LG Y-sustain IPM modules

My 50HP66 is working great! Found a bad FET on lower Y buffer board p/n FQB46N15. Couldn't find an exact replacement from a parts house so I stole one from another project plasma ( LG 42"). That restored my VSC voltage. Then I bought a pair of C series IPMs from an ebay vendor from Texas, installed them in my YSUS, and Wa-Hoo - 50" Plasma JOY! I read many recommendations about replacing the IPMs in matched pairs and so far I am a believer as many people have replaced just one, only to have it fry within minutes. Mine has been running...

Re: 50" LG Y-sustain IPM modules

The manual in the link I posted above shows a power distribution schematic of the boards. I have the .pdf file downloaded and saved.

Re: 50" LG Y-sustain IPM modules



The IPM (Intelligent Power Module) is the large hybrid chip under each of the two large heatsinks on the YSUS and ZSUS boards.

Role of IPMs

1. Generate Sustain Waveform (square wave) – SUS IPM
2. Energy Recovery Function (for saving power) – ER IPM

**found info in this manual [url]http://www.scribd.com/doc/16077007/LG-50PC1DRTroubleshootingManual-2007-VG-Training[/url]

I am wrestling with a Toshiba 50HP66 with a 50X3 panel. The 18v on the YSUS measures...

Re: 50" LG Y-sustain IPM modules



Did you post the pics?...

Re: Hotchip ODT-4000HD bad caps in PSU



I have a Western Digital External HDD that kept faulting. It is powered by a REXON AC-005 power brick that supplies 5vdc and 12vdc. I think it was the 5 volt line (can't remember) that would be ok if no HDD was attached to the enclosure. It dipped way down when a HDD was plugged in. I cracked open the PS and found two bulging, slightly leaking CTC 1000uF 16v capacitors. I swapped them with some from a dead desktop psu and it works fine now even though they were junk Jamicons. I am going to order some good ones to recap the whole...